CN108686493A - Flue-gas dust-removing and desulfurization tower and dust-removing and desulfurization process - Google Patents
Flue-gas dust-removing and desulfurization tower and dust-removing and desulfurization process Download PDFInfo
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- CN108686493A CN108686493A CN201710237617.9A CN201710237617A CN108686493A CN 108686493 A CN108686493 A CN 108686493A CN 201710237617 A CN201710237617 A CN 201710237617A CN 108686493 A CN108686493 A CN 108686493A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/12—Washers with plural different washing sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses flue-gas dust-removing and desulfurization tower and dust-removing and desulfurization process.Liquid bath area is held in the flue-gas dust-removing and desulfurization tower of the present invention, including pretreatment unit, advanced treatment unit and bottom of tower, and the pretreatment unit is connected to advanced treatment unit by flue.The pretreatment unit is from top to bottom followed successively by chilling spraying zone, level-one spraying zone, venturi grid scrubbing section;The advanced treatment unit is followed successively by middle part and holds liquid bath area, two level spraying zone, mist eliminating zone and flue gas emission area from the bottom to top.The present invention realizes the triple functions of flue gas ash removal, desulfurization and demisting in a tower, and each functional area coordinated mutually promotes, significantly reduces the floor space of equipment, significantly reduces the expense needed for plant construction, transformation.
Description
Technical field
The invention belongs to industrial waste gas purifying fields, are related to flue-gas dust-removing and desulfurization tower and dust-removing and desulfurization process.
Background technology
Contain sulfur dioxide and dust in the flue gas of boiler smoke and plant emissions, sulfur dioxide and dust are air dirts
The main composition dust of object is contaminated, sulfur dioxide is the main reason for forming acid rain, and the smaller dust of grain size is the haze to be formed crime
One of stalwart chief culprit.
Wet desulphurization is high with desulfurization degree, device is reliable for operation, simple operation and other advantages, thus the existing cigarette in countries in the world
Desulfurization technology is mainly based on wet desulphurization.Traditional Wet Flue Gas Desulfurization Technique mainly has limestone-gypsum method, Dual alkali de-
Sulphur, sodium alkali desulfurization, ammonia process of desulfurization method etc..Above-mentioned flue gas desulfurization technique mainly uses countercurrent spray, and alkaline slurry is from desulfurizing tower
Top is sprayed, and free settling is contacted with flue gas adverse current under the effect of gravity realizes desulphurization reaction.
The grain size of dust is smaller in flue gas, and most of between 0.1 ~ 200 μm, flue gas ash removal technology is mainly cloth bag at present
Formula dedusting technology, electrostatic precipitator technology, wet dust collection technology.Due to containing moisture in flue gas, dust is in fiber bag precipitator
Moisture absorption is cohered on filter bag, blocks the hole of filter bag, thus needs that frequently filter bag is cleared up or replaced, and fiber bag precipitator is answered
With being extremely limited;The major defect of electrostatic precipitator is that cost is higher, and installation is safeguarded, manages requirement strictly, and height is needed
Buckling electricity and commutation control equipment, power consumption is higher, and floor space is larger;Wet dust collection technology mainly removes cigarette by shower water
After being combined with dust still chimney can be discharged with flue gas in the dust carried in gas, the smaller drop of grain size.
On December 11st, 2015 Environmental Protection Department, National Development and Reform Commission, National Energy Board joint publication"It is comprehensively real
Apply coal-burning power plant's minimum discharge and reducing energy consumption programme of work"(Ring sends out [2015]No. 164), regulation is to the year two thousand twenty whole nation in scheme
Strive realizing ultra-clean discharge, i.e., under the conditions of benchmark oxygen content 6%, exhaust gas dust in all coal-burning power plants for having transformation condition
≯10mg/Nm3, SO2≯35mg/Nm3.Existing wet desulphurization device is difficult to meet the requirement of discharge standard.
Large-scale promotion application with wet type desulfurizing technology in China, one of wet type desulfurizing technology apparent and be difficult to gram
The shortcomings that taking gradually reveals, which is exactly to discharge flue gas to will produce " white cigarette " phenomenon in throat, or even can form number
" the white cigarette long queue " of kilometer, strong visual impact is brought to people, ground there is also " dust-shower " phenomenon sometimes.So how
The problem that " white cigarette " phenomenon is urgently to be resolved hurrily at present can be eliminated.
Invention content
In view of the deficiencies of the prior art, a kind of flue-gas dust-removing and desulfurization tower of present invention offer and dust-removing and desulfurization process, the present invention
Flue-gas dust-removing and desulfurization tower pretreatment unit realize flue gas chilling, desulfurization and dedusting, advanced treatment unit realize flue gas
Deep desulfuration, dedusting and demisting, meet the requirement of national ultra-clean discharge, remove the supersaturation water carried in flue gas, substantially
" white cigarette " phenomenon after flue gas emission is reduced, present invention process flow is short, equipment is few, floor space is few, has wide application
Foreground.
Liquid bath area is held in the flue-gas dust-removing and desulfurization tower of the present invention, including pretreatment unit, advanced treatment unit and bottom of tower, pre- to locate
Reason unit is connected to advanced treatment unit by flue, and three constitutes " Jiu shapes " Double-Tower Structure;Pretreatment unit is from top to bottom
It is followed successively by chilling spraying zone, level-one spraying zone, venturi grid scrubbing section;Advanced treatment unit is followed successively by middle part and holds from the bottom to top
Liquid bath area, two level spraying zone, mist eliminating zone and flue gas emission area.
The flue-gas dust-removing and desulfurization tower of the present invention, the pretreatment unit is 0.2 ~ 1 with advanced treatment unit tower diameter ratio, excellent
It is selected as 0.4 ~ 1.
It is connected with flue gas pipeline at the top of the chilling spraying zone;Chilling spraying zone axis sets up several opening upwards
Or downward heavy caliber atomizer, each heavy caliber atomizer are connected with spray pipe I, the entrance of heavy caliber atomizer connects
The tower diameter ratio of head tube diameter and chilling spraying zone is 0.005 ~ 0.1, preferably 0.01 ~ 0.06;The heavy caliber atomizer
Spray angles are 60 ~ 150 °, and optimized angle is 120 ~ 150 °;The water mist of spray is in solid conical, and conical bottom surface diameter is big
In the tower diameter of chilling spraying zone;Preferably at least include that a pair of openings is opposite(One Open Side Down, another opening upwards)It is big
Bore atomizer, more preferably 2 ~ 3 pairs;Two conical surfaces that the opposite heavy caliber atomizer of each pair of opening sprays out are mutual
The plane for being formed and covering entire tower diameter is mutually hit, the plane is comprehensive to flue gas progress effectively to be intercepted, and realizes the chilling drop of flue gas
Temperature, and remove the dust and sulfur dioxide carried in flue gas.Every spray pipe I can connect 1 heavy caliber atomizer or
2 opposite heavy caliber atomizers of opening direction;The inlet attack caliber of the heavy caliber atomizer generally can be
DN50~200。
One or more layers spray pipe II is arranged in the level-one spraying zone, when Multi-layer sprinkling pipeline II is set, spray tube
The distance between line II is 0.5 ~ 5m, and preferred distance is 1 ~ 2.5m;The spray pipe II connection loop slurry pipeline II, spray
It is provided with multiple atomizers on shower pipe line II;The level-one spraying zone is for loop slurry to be atomized, the small liquid after atomization
Drop and flue gas current contacting, remove the dust and sulfur dioxide carried in flue gas.
The venturi grid scrubbing section is provided with one or more layers venturi grid, when using multilayer venturi grid
Two layers neighbouring of venturi grid is staggered;The venturi grid is enhancing loop slurry to dust in flue gas
And SO2Washing effect, increase to dust and SO2Removal efficiency.
It holds liquid bath area and is separately connected alkaline solution line I, bottom of tower overflow line and liquid close to tower wall side in the bottom of tower
Position meter;Flow control valve is set on the alkaline solution line I, its pH is adjusted for filling alkaline solution into bottom of tower slurries
Value;The bottom of tower overflow line is used for the automatic-discharging bottom of tower slurries when the liquid level of bottom of tower slurries is more than setting value, avoids tower
Bottom slurry plugs flue;Hold liquid bath area bottom connection bottom of tower slurries extraction pipeline, bottom of tower slurries extraction pipe in the bottom of tower
Line is connected with bottom of tower circulating pump, realize bottom of tower slurries chilling spraying zone and level-one spraying zone circulated sprinkling.
The middle part holds liquid bath area and several liters of inflators is arranged, and the flue gas from pretreatment unit enters depth through flue
Processing unit is spent, two level spraying zone is entered by a liter inflator;The one or more overflow pipe I of liquid bath area setting are held at the middle part,
For overflow pipe I height less than an inflator height is risen, middle part, which holds the circulation fluid in liquid bath and enters bottom of tower by overflow pipe I, holds liquid bath area;Institute
The middle part stated holds liquid bath bottom and is connected with middle part circulation fluid extraction pipeline, and middle part circulation fluid extracts pipeline and middle part circulating pump phase out
Even, circulated sprinkling of the circulation fluid in two level spraying zone in the middle part of realizing.
It holds liquid bath area and is connected with fresh water pipeline and alkaline solution line II close to tower wall side in the middle part;Described
Flow control valve is set on fresh water pipeline, according to the flow of the Signal Regulation fresh water of bottom of tower liquid level gauge feedback, for controlling
Hold the liquid level in liquid bath area in bottom of tower;It is provided with flow control valve on the alkaline solution line II, is extracted out according to middle part circulation fluid
The Signal Regulation for the pH meter feedback being arranged on pipeline holds the flow for the alkaline solution that liquid bath area fills to middle part.
One or more layers spray pipe III is arranged in the two level spraying zone, when Multi-layer sprinkling pipeline III is set, spray
The distance between pipeline III is 0.5 ~ 5m, and preferred distance is 1 ~ 2.5m;Liquid pipe is recycled in the middle part of the spray pipe III connections
Line is provided with multiple atomizers on spray pipe III;The two level spraying zone is for circulation fluid to be atomized, after atomization
Droplet is contacted with flue gas adverse current, to carrying out depth dedusting and desulfurization in flue gas.
The two level spraying zone is preferably connected by reverse taper deformation diameter with mist eliminating zone, and the mist eliminating zone is sprayed with two level
The tower diameter ratio for drenching area is 1.2 ~ 3.
The mist eliminating zone is provided with demister, and demister includes several demisting components arranged side by side, each demisting component
Include riser and outer barrel, outer barrel is arranged in the outside of riser, preferably on the same axis with riser;Riser is fixed
On mist eliminating zone tower tray, the top setting capping plate of riser;Several rectification channels, rectification are uniformly arranged on the circumference of riser
Channel is embedded in along the tangential direction level of riser outer wall, side wall I and riser tube wall phase of the rectification channel close to outer barrel side
It cuts, another side wall II intersects with riser tube wall, and each rectification channel direction of rotation is identical;Rectification channel roof and capping plate are neat
Flat, bottom is intersected with riser tube wall.
In the demister, the generally setting 1 ~ 12 of rectification channel, preferably 4-8.The wall thickness in rectification channel preferably with
The wall thickness of riser is identical.
In the demister, the length l in rectification channel is the length of side wall II, and width w is between the two side of rectification channel
Maximum horizontal range, maximum normal distances of the height h between rectification channel roof and bottom;Wherein length l be width w 2 ~
5 times, preferably 3 ~ 4 times;The cross sectional shape in rectification channel be rectangle, ellipse, circle, it is trapezoidal or semicircle etc. in one kind or
Several combinations, one or more of preferably rectangular, oval or round combination.The size in rectification channel is according to actual work
Condition or design requirement, are determined by those skilled in the art, and the height h in such as rectification channel is generally 20~600mm, excellent
It is selected as 100~300mm;The width w in rectification channel is generally 10~200mm, preferably 20~100mm.The total of rectification channel cuts
Area is 0.2 ~ 0.9 times of riser cross-sectional area, preferably the 0.3 ~ 0.6 of riser cross-sectional area times.
In the demister, the ends side wall II in rectification channel can flush or extend into riser with riser inner wall
Internal certain distance m, m are 0.1 ~ 0.9 times, preferably 0.3 ~ 0.6 times of length l.The ends side wall II when rectification channel and liter
When inner surface of trachea flushes, rectification the bottom of the channel end is also flushed with riser inner wall;When the side wall II in rectification channel extend into liter
When pipe certain distance m, rectification the bottom of the channel end is flushed with side wall end.
In the demister, it is 20~200mm that there are certain distance A, distance A in rectification the bottom of the channel apart from tower tray, preferably
For 40~80mm.
In the demister, riser lower end is concordant with tower tray or is less than tower tray a distance, the two airtight connection;It rises
The diameter of tracheae and the percent opening of tower tray can be given really according to actual operating mode or design requirement by those skilled in the art
It is fixed.
In the demister, rectification channel, capping plate and riser can weld together or global formation.
In the demister, outer barrel is preferably cylinder, and outer barrel diameter D is 1.5-6 times of draft tube diameter d, preferably
2-3 times.Upper edge the certain distance P, distance P that the upper edge of outer barrel is higher by riser are 1~8 times of rectification channel height h, preferably
2~5 times.The lower edge of outer barrel has a certain distance B apart from tower tray, and less than the lower edge in rectification channel, outer barrel lower edge away from tower tray away from
It is 5~100mm, preferably 20~50mm from B.The overall height H of outer barrel is 2.5~10 times of rectification channel height, preferably 3~
5 times.The shape of outer barrel can also be the combination of one or more of cone cylinder, inversed conical drum or reducing cylinder etc..
In the demister, the inner surface setting groove and/or protrusion of outer barrel.Protrusion or the axis of groove and outer barrel are flat
Row, or can form an angle with axis.The section of the groove or protrusion can also be rectangle, triangle or circle etc.
Suitable shape.
In the demister, the inner surface of the outer barrel is preferably provided with the groove of cross sectional shape as shown in FIG. 6, should
The section of groove is made of a circular arc and straight line section;The intersection point of wherein circular arc and outer tube inner surface circumference does circular arc respectively
With the tangent line of circumference, the angle between tangent line is α, and α is 5 ° ~ 70 °, preferably 10 ° ~ 40 °;It is done at circular arc and straightway intersection point
The tangent line of circular arc and the angle of straightway be β, β is 30 ° ~ 110 °, preferably 45 ° ~ 90 °.The depth Z of groove, i.e. circular arc with
The shortest distance on straightway intersection point to outer tube inner surface circumference is 0.1 ~ 0.7 times, preferably 0.3 ~ 0.5 times of outer barrel wall thickness;
Arc length X between the intersection point and straightway and the intersection point of outer tube inner surface circumference of circular arc and outer tube inner surface circumference is outer tube inner surface
The 1/80 ~ 1/6 of circumference.
The junction of each component of the demister ensures sealing, does not generate gas leak phenomenon.
The demister, when work, the gas of entrained drip enters riser, Vapor Entrainment liquid from tower tray lower space
Mutually rising, gas phase flow direction changes after encountering capping plate, i.e., is changed to horizontal or level of approximation direction by ascent direction, and
Part droplet is attached to since effect of inertia and capping plate collide on capping plate, and the drop of attachment becomes larger, when
Drop arrive greatly its own generation gravity be more than gas climbing power and surface tension of liquid resultant force when, drop just from cover plate
It is separated on surface, completes first time gas-liquid separation;The gas of entrained drip enters along horizontal or level of approximation direction
Rectification channel, since there is certain length in rectification channel, and rectification channel total sectional area is less than riser cross-sectional area, originally speed
The gas for spending the more dispersed entrained drip in direction, after entering rectification channel, directional velocity is changed to the side along rectification channel
To, directional velocity comparison rule and concentration, and since circulation area reduces, it is fast after so that the gas of entrained drip is entered rectification channel
Degree increases.When the directional velocity of the gas of entrained drip changes, partial drop collides with rectification vias inner walls, and is attached to
It in rectification vias inner walls, and then is constantly flowed through the gas blowout rectification channel in rectification channel and is fallen, complete second of gas-liquid
Separation.Meanwhile in rectification channel, since the gas velocity direction of entrained drip changes, part droplet is in inertia force effect
Lower generation mutually collision, droplet aggregation becomes big drop, and speed increases when the gas stream rectified channel of entrained drip, adds
The acute movement of drop, improves the probability that droplet mutually collides, and so that droplet is easier to assemble and is become big drop, and with gas
Body is together with larger speed outflow rectification channel.The gas of the entrained drip flowed out from rectification channel has larger speed,
Directional velocity compares concentration, and the drop carried secretly is bigger, and continuation collides with outer tube inner wall, changes the flowing of gas again
Direction, the i.e. gas of entrained drip along rectification channel direction by being changed to flow along the circumferencial direction of outer tube inner wall.Due to folder
Guttiferous gas velocity is larger, and is flowed up along reeded outer tube inner wall rotation is opened up, therefore will produce brighter
Aobvious shaving effect.The shaving effect, when referring to that the high-speed gas of entrained drip is flowed up along outer tube inner wall rotation, liquid
It drops under the action of inertia force and is constantly thrown toward outer, drop enters groove and the arc section in groove moves, due to angle α
It is 5 ° ~ 70 °, the arc surface that drop continues on groove can be made to do and smoothly move, contact aggregation becomes larger between drop, until meeting
It is hindered to straightway, assemble the drop to become larger and hit strongly with straightway wall surface, and is attached to the straight of outer tube inner wall groove
On line segment, drop continues to assemble and become larger, and then goes downstream along outer tube inner wall;And gas then continues to keep high speed along outer barrel
Wall rotation flows up, and realizes gas-liquid separation for the third time, and reduce entrainment.By above-mentioned rectification, accelerates and scrape
Face effect makes fluid realize the separation of drop and gas in flow process.
The mist eliminating zone is preferably connected by cone-shaped reducing with flue gas emission area, the mist eliminating zone and flue gas emission
The tower diameter ratio in area is 1.2 ~ 5.
The flue gas emission area is generally the chimney structure in conventional flue gas wet desulphurization process, the chimney bottom
Portion is connected with mist eliminating zone tower body, is preferably connected with mist eliminating zone tower body by cone-shaped reducing, and exhanst gas outlet is arranged in chimney top;It is excellent
It is selected in chimney top setting outer sleeve, the outer sleeve is the tubular structure of upper and lower opening, can be cylindric or cone cylinder shape,
Outer sleeve upper edge is higher by chimney top certain distance, generally 0.2~10m, preferably 0.5~5m, and the lower edge of outer sleeve is less than
The upper edge of chimney, preferably shorter than 0.5 ~ 5m of chimney upper edge;It is annular space between the outer sleeve and chimney, preferably bottom is opened
1.01~1.2 times of a diameter of chimney top opening diameter of mouth.The flue gas enters outer sleeve from chimney top, from outer sleeve
Top is discharged, and the gas velocity of flue gas is higher, can generate negative pressure between chimney and outer sleeve when flowing through outer sleeve, air is in negative pressure
Suction under flow through between chimney and outer sleeve annular space enter outer sleeve top, air is in outer sleeve and flue gas
Together from outer sleeve top discharge after mixing, flue gas has just been sufficiently mixed with air before leaving outer sleeve top discharge, greatly
Width reduces " white cigarette " production quantity.
A kind of dusting and desulfurizing technology for smoke is provided while of the invention, the process employs above-mentioned flue-gas dust-removing and desulfurizations
Tower.
The dusting and desulfurizing technology for smoke of the present invention, including following content:Flue gas enters flue gas from the top of pretreatment unit
Dedusting and desulfurizing tower, contacted with the loop slurry of chilling spraying zone carry out chilling cooling and remove the part dust carried in flue gas and
Sulfur dioxide enters level-one spraying zone across the flue gas of chilling spraying zone, after level-one spraying zone is mixed with loop slurry together
By venturi grid scrubbing section, the components such as dust and sulfur dioxide in flue gas are absorbed by loop slurry;Loop slurry and cigarette
Gas completes gas-liquid separation, and loop slurry enters bottom of tower and holds liquid bath area, and the riser that flue gas holds liquid bath through middle part enters two level spray
Area carries out depth dust-removal and desulfurizing with the circulation fluid counter current contacting of two level spraying zone, and the flue gas by two level spraying zone enters demisting
Area removes the small water droplet carried in flue gas through mist eliminating zone, it is abundant with air to enter outer sleeve from the chimney top in flue gas emission area
From flue gas emission area top discharge after mixing.
In present invention process, the flue gas is fire coal boiler fume, coal-fired plant flue gas, catalytic cracking catalyst regeneration
Flue gas, Furnace flue gas, coking flue gas or steel sintering flue gas etc..SO in flue gas2A concentration of 50 ~ 5000mg/Nm3, preferably
200~2000 mg/Nm3, dust concentration is 30 ~ 600 mg/Nm3, preferably 100 ~ 400 mg/Nm3。
In present invention process, the operating condition of the flue-gas dust-removing and desulfurization tower is:Operation temperature is 60 ~ 300 DEG C, operation
Pressure is 0.1 ~ 500kPa, and treatment quantity is 1000 ~ 1000000Nm3/h。
In present invention process, the chilling spraying zone, level-one spraying zone, the liquid-gas ratio in two level spraying zone be 2 ~
30L/Nm3, it is preferably in a proportion of 5 ~ 25L/Nm3。
In present invention process, it is molten that the alkaline solution is selected from sodium hydroxide solution, calcium hydroxide solution, magnesium hydroxide
One kind or several in liquid, sodium carbonate liquor, sodium sulfite solution, sodium citrate solution, lime stone slurry, ammonium hydroxide or seawater etc.
Kind.
In present invention process, the loop slurry holds liquid bath area from bottom of tower, after the pressurization of bottom of tower circulating pump, a part
Chilling cooling is carried out to flue gas into chilling spraying zone, another part enters level-one spraying zone and is dusted desulfurization to flue gas,
It is remaining to be delivered to subsequent cell through comb line outside loop slurry and handled.
In present invention process, the liquid level of loop slurry in liquid bath area is held by the tune on fresh water pipeline in the bottom of tower
Section valve is controlled.
In present invention process, the pH value control of the loop slurry in liquid bath area is held 6 ~ 11 in the bottom of tower, preferable ph
Control range is that 7 ~ 8, pH on-line detectors are located on the pump entry pipeline of bottom of tower, by adjusting on alkaline solution line I
Regulating valve carrys out the pH value of control loop slurries.
In present invention process, the bottom of tower loop slurry effluent stream amount is according to the concentration of suspension in the loop slurry of bottom of tower
It is adjusted, the concentration of suspension control in the loop slurry of bottom of tower is 0.1 ~ 1.5g/L, and preferred concentration is 0.2 ~ 1.0g/L, is suspended
Object concentration measuring apparatus is located on the pump entry pipeline of bottom of tower, by adjusting loop slurry effluent stream amount come control loop slurries
Concentration of suspension.
In present invention process, the circulation fluid in liquid bath is held at the middle part, and entering two level after the pressurization of middle part circulating pump sprays
Area is drenched, is atomized and contacts with flue gas adverse current to the dedusting of flue gas progress depth, desulfurization through atomizer.
In present invention process, the pH value control of the circulation fluid in liquid bath area is held 6 ~ 8 in the middle part, the control of preferable ph
Ranging from 6.5 ~ 7.5, pH on-line detectors are located on the pump entry pipeline of middle part, by adjusting on alkaline solution line II
Regulating valve come control middle part circulation fluid pH value.
Compared with the prior art, the advantages of the present invention are as follows:
1, the present invention uses heavy caliber atomizer, the opposite atomizer of split shed to spray two circular cones in chilling spraying zone
The plane for being formed and covering entire tower diameter is hit mutually in shape face, which realizes flue gas and comprehensively effectively intercept, and realizes flue gas
Chilling cools down, and removes the dust and sulfur dioxide carried in flue gas, further mitigates the burden in follow-up work area, significantly carries
The high dedusting of flue gas, desulfuration efficiency.
2, demister of the invention effectively removes the smaller drop of the grain size carried secretly in gas, and demisting efficiency is high;Gas stream
Dynamic uniform, flow resistance is small, and pressure drop is low;It is simple in structure, it is easy to make, it is not easy to plug and fouling, without backwash;Water-saving result
Good, the moisture removed from the gas of entrained drip can reduce water consumption with recycling.
3, cone-shaped reducing is arranged in flue gas emission area of the present invention and mist eliminating zone, is conducive to the flow velocity for improving flue gas, flue gas
Gas velocity is bigger, and it is higher that flue gas leaves the rising height behind flue gas emission area, is more conducive to the diffusion of flue gas, thus plume is shorter.
4, fuel gas desulfurization gas wash tower flue gas emission area of the invention is using the structure of " chimney+outer sleeve ", and flue gas is by removing
Negative pressure is generated after the acceleration of fog-zone and cone-shaped reducing, when flue gas flows through outer sleeve to suck outside air, flue gas exists with air
From outer sleeve top discharge after being sufficiently mixed in outer sleeve, " white cigarette " production quantity is significantly reduced.
5, flue-gas dust-removing and desulfurization tower Wei " Jiu shapes of the invention " structure, realizes flue gas ash removal, desulfurization and is removed in a tower
The triple functions of mist, each functional area coordinated, mutually promote, and significantly reduce the floor space of equipment, significantly reduce
Expense needed for plant construction, transformation.
Description of the drawings
Fig. 1 is flue-gas dust-removing and desulfurization tower structure schematic diagram of the present invention.
Fig. 2 is present invention process flow diagram.
Fig. 3 is the demister structural schematic diagram of flue-gas dust-removing and desulfurization tower of the present invention.
Fig. 4 is a kind of rectification channel and the schematic cross-section with groove outer barrel in the demister of the present invention.
Fig. 5 is another rectification channel and the schematic cross-section with raised outer barrel in the demister of the present invention.
Fig. 6 is that the demister middle section of the present invention is the groove schematic diagram that circular arc and straightway are constituted.
In figure:1- pretreatment units;2- holds bottom of tower liquid bath area;3- advanced treatment units;4- chilling spraying zones;5- level-ones are sprayed
Drench area;6- venturi grid scrubbing sections;Liquid bath area is held in the middle part of 7-;8- two level spraying zones;9- reverse taper deformation diameters;10- mist eliminating zones;
11- cone-shaped reducings;12- flue gas emissions area;Circulating pump in the middle part of 13-;The bottoms of tower 14- circulating pump;15- heavy caliber atomizers;16-
Spray pipe I;17- spray pipes II;18- atomizers;19- venturi grids;Liquid bath is held in the middle part of 20-;21- overflow pipes I;
22- rises inflator;23- spray pipes III;24- demisters;25- chimneys;26- outer sleeves;
Wherein, 1-1- flue gases pipeline;2-1 liquid level gauges;The bottoms of tower 2-2 overflow line;The bottoms of tower 2-3 slurries extract pipeline out;2-4 alkalinity is molten
Liquid pipe line I;2-5 loop slurry Trunk Lines;The outer comb line of 2-6 loop slurries;4-1 loop slurry pipelines I;5-1 recycle slurry liquid pipes
Line II;The fresh water pipelines of 7-1;7-2 alkaline solution lines II;Circulation fluid extracts pipeline out in the middle part of 7-3;Circulation fluid pipeline in the middle part of 8-1;
24-1- mist eliminating zone tower trays;24-2- riseies;24-3- rectifications channel;24-4- outer barrels;24-5- covers plate;24-6- grooves;24-
7- protrusions.
Specific implementation mode
Below in conjunction with drawings and examples, the present invention will be described in detail.
Liquid bath area 2 is held in the flue-gas dust-removing and desulfurization tower of the present invention, including pretreatment unit 1, advanced treatment unit 3 and bottom of tower,
Pretreatment unit 1 is connected to advanced treatment unit 3 by flue, and three constitutes " Jiu shapes " Double-Tower Structure;The pretreatment
Unit 1 is from top to bottom followed successively by chilling spraying zone 4, level-one spraying zone 5, venturi grid scrubbing section 6;The advanced treating list
Member 3 is followed successively by middle part and holds liquid bath area 7, two level spraying zone 8, mist eliminating zone 10, flue gas emission area 12 from the bottom to top.
The flue-gas dust-removing and desulfurization tower of the present invention, the pretreatment unit 1 are 0.2 ~ 1 with 3 tower diameter ratio of advanced treatment unit,
It is preferably in a proportion of 0.4 ~ 1.
4 top of chilling spraying zone is connected with flue gas pipeline 1-1;If 4 axis of chilling spraying zone is set up
Dry opening upwards or downward heavy caliber atomizer 15, each heavy caliber atomizer 15 are connected with spray pipe I 16, greatly
The inlet attack caliber of bore atomizer 15 and the tower diameter ratio of chilling spraying zone 4 be 0.005 ~ 0.1, preferably 0.01 ~
0.06;15 spray angles of heavy caliber atomizer are 60 ~ 150 °, and optimized angle is 120 ~ 150 °;The water mist of spray is in
Solid conical, conical bottom surface diameter are more than the tower diameter of chilling spraying zone 4;Preferably at least include that a pair of openings is opposite(One
Open Side Down, another opening upwards)Heavy caliber atomizer 15, more preferably 2 ~ 3 pairs;The opposite heavy caliber of each pair of opening
Two conical surfaces that atomizer 15 sprays out hit mutually the plane for being formed and covering entire tower diameter, which carries out flue gas
It is comprehensive effectively to intercept, realize the chilling cooling of flue gas, and remove the dust and sulfur dioxide carried in flue gas.Every spray tube
Line I 16 can connect the 2 heavy caliber atomizers 15 of 1 heavy caliber atomizer 15 or opening direction on the contrary;Described is big
The inlet attack caliber of bore atomizer 15 generally can be DN50 ~ 200.
One or more layers spray pipe II 17 is arranged in the level-one spraying zone 5, when Multi-layer sprinkling pipeline II 17 is set,
The distance between spray pipe II 17 is 0.5 ~ 5m, and preferred distance is 1 ~ 2.5m;The connections of spray pipe II 17 cycle
It is provided with multiple atomizers 18 on slurry line II 5-1, spray pipe II 17;The level-one spraying zone 5 will be for that will follow
Ring slurry spraying, the droplet after atomization and flue gas current contacting, remove the dust and sulfur dioxide carried in flue gas.
The venturi grid scrubbing section 6 is provided with one or more layers venturi grid 19, using multilayer venturi lattice
Two layers neighbouring of venturi grid 19 is staggered when grid 19;The venturi grid 19 is enhancing loop slurry pair
Dust and SO2Washing effect, increase to dust and SO2Removal efficiency.
It holds liquid bath area 2 and is separately connected alkaline solution line I 2-4, bottom of tower overflow line close to tower wall side in the bottom of tower
2-2 and liquid level gauge 2-1;Flow control valve is set on the alkaline solution line I 2-4, for being filled into bottom of tower slurries
Alkaline solution adjusts its pH value;The bottom of tower overflow line 2-2 is used for automatic when the liquid level of bottom of tower slurries is more than setting value
Bottom of tower slurries are discharged, bottom of tower slurry plugs flue is avoided;Hold 2 bottom of liquid bath area connection bottom of tower slurries extraction in the bottom of tower
Pipeline 2-3, bottom of tower slurries extraction pipeline 2-3 are connected with bottom of tower circulating pump 14, realize bottom of tower slurries in chilling spraying zone 4 and one
The circulated sprinkling of grade spraying zone 5.
The middle part holds liquid bath area 7 and is arranged several liters of inflators 22, the flue gas from pretreatment unit 1 through flue into
Enter advanced treatment unit 2, two level spraying zone 8 is entered by liter inflator 22;It holds liquid bath area 7 and is arranged one or more in the middle part
21 height of a overflow pipe I 21, overflow pipe I passes through overflow pipe less than 22 height of inflator, the circulation fluid that middle part is held in liquid bath 20 is risen
I 21 holds liquid bath 2 into bottom of tower;The middle part holds 20 bottom of liquid bath and is connected with middle part circulation fluid extraction pipeline 7-3, and middle part is followed
Ring liquid extraction pipeline 7-3 be connected with middle part circulating pump 13, realize in the middle part of circulation fluid two level spraying zone 8 circulated sprinkling.
It holds liquid bath area 7 and is connected with fresh water pipeline 7-1 and alkaline solution line II close to tower wall side in the middle part
7-2;Flow control valve is set on the fresh water pipeline 7-1, the Signal Regulation fed back according to bottom of tower liquid level gauge 2-1 is fresh
The flow of water is used for the liquid level in control tower Di Chi liquid baths area 2;It is provided with flow-rate adjustment on the alkaline solution line II 7-2
Valve, the Signal Regulation for extracting the pH meter feedback being arranged on pipeline 7-3 out according to middle part circulation fluid hold the alkali that liquid bath area 7 fills to middle part
The flow of property solution.
One or more layers spray pipe III 23, setting Multi-layer sprinkling pipeline III 23 is arranged in the two level spraying zone 8
When, the distance between spray pipe III 23 is 0.5 ~ 5m, and preferred distance is 1 ~ 2.5m;The connections of spray pipe III 23
It is provided with multiple atomizers 18 on middle part circulation fluid pipeline 8-1, spray pipe III 23;The two level spraying zone 8 is used for
Circulation alkali liquor is atomized, the droplet after atomization is contacted with flue gas adverse current, to carrying out depth dedusting and desulfurization in flue gas.
The two level spraying zone 8 is preferably connected by reverse taper deformation diameter 9 with mist eliminating zone 10, the mist eliminating zone 10 with
The tower diameter ratio of two level spraying zone 8 is 1.2 ~ 3.
The mist eliminating zone 10 is provided with demister 24, and demister 24 includes several demisting components arranged side by side, is each removed
Mist component includes riser 24-2 and outer barrel 24-4, and outer barrel 24-4 is arranged in the outside of riser 24-2, preferably with riser
24-2 is on the same axis;Riser 24-2 is fixed on 10 tower tray 24-1 of mist eliminating zone, the top setting capping of riser 24-2
Plate 24-5;Several rectification channel 24-3 are uniformly arranged on the circumference of riser 24-2, rectification channel 24-3 is outside riser 24-2
The tangential direction level of wall is embedded in, and side wall Is and riser 24-2 tube wall of the rectification channel 24-3 close to the sides outer barrel 24-4 are tangent,
Another side wall II intersects with riser 24-2 tube walls, and each rectification channel direction of rotation 24-3 is identical;At the top of the 24-3 of rectification channel with
Capping plate 24-5 is flushed, and bottom is intersected with riser 24-2 tube walls.
In the demister 24, rectification channel 24-3 generally settings 1 ~ 12, preferably 4-8.Rectification channel 24-3's
Wall thickness is preferably identical as the wall thickness of riser 24-2.
In the demister 24, the length l of rectification channel 24-3 is the length of side wall II, and width w is rectification channel 24-
Maximum horizontal range between 3 two sides, height h are the maximum normal distance between the top and bottom rectification channel 24-3;It is wherein long
Spend 2 ~ 5 times, preferably 3 ~ 4 times that l is width w;The cross sectional shape of rectification channel 24-3 be rectangle, ellipse, circle, it is trapezoidal or
The combination of one or more of semicircle etc., one or more of preferably rectangular, oval or round combination.Rectification channel
The size of 24-3 determined according to actual operating mode or design requirement by those skilled in the art, such as the rectification channel 24-
3 height h is generally 20~600mm, preferably 100~300mm;The width w of rectification channel 24-3 is generally 10~200mm,
Preferably 20~100mm.The total sectional area of rectification channel 24-3 is 0.2 ~ 0.9 times of riser 24-2 cross-sectional areas, preferably
0.3 ~ 0.6 times of riser 24-2 cross-sectional areas.
In the demister 24, the ends side wall II of the rectification channel 24-3 can be neat with riser 24-2 inner walls
Certain distance m inside riser 24-2 is put down or extend into, m is 0.1 ~ 0.9 times, preferably 0.3 ~ 0.6 times of length l.Work as rectification
When the ends side wall II of channel 24-3 are flushed with riser 24-2 inner walls, rectification channel 24-3 bottom ends also with riser 24-2
Inner wall flushes;When the side wall II of rectification channel 24-3 extend into riser 24-2 inside certain distance m, the rectification channel bottoms 24-3
Portion end is flushed with side wall end.
In the demister 24, rectification channel 24-3 distance from bottom tower trays 24-1 has a certain distance A, and distance A is 20~
200mm, preferably 40~80mm.
In the demister 24, the lower ends riser 24-2 are concordant with tower tray 24-1 or are less than tower tray 24-1 a distances,
The two airtight connection;The diameter of riser 24-2 and the percent opening of tower tray 24-1 can according to actual operating mode or design requirement,
It is determined by those skilled in the art.
In the demister 24, the rectification channel 24-3, capping plate 24-5 and riser 24-2 can be welded on
Together or global formation.
In the demister 24, the outer barrel 24-4 is preferably cylinder, and outer barrel 24-4 diameters D is that riser 24-2 is straight
1.5-6 times of diameter d, preferably 2-3 times.Upper edge the certain distance P, distance P that the upper edge of outer barrel 24-4 is higher by riser 24-2 be
1~8 times of rectification channel 24-3 height h, preferably 2~5 times.The lower edge of outer barrel 24-4 has certain distance B apart from tower tray 24-1,
And less than rectification channel 24-3 lower edge, distance B of the outer barrel 24-4 lower edges away from tower tray 24-1 be 5~100mm, preferably 20~
50mm.The overall height H of outer barrel 24-4 is 2.5~10 times, preferably 3~5 times of rectification channel 24-3 height.The shape of outer barrel 24-4
Shape can also be the combination of one or more of cone cylinder, inversed conical drum or reducing cylinder etc..
In the demister 24, groove 24-6 and/or protrusion 24-7 is arranged in the inner surface of the outer barrel 24-4.Protrusion
24-7 or groove 24-6 are parallel with the axis of outer barrel 24-4, or can form an angle with axis.The groove 24-6 or
The section of raised 24-7 can also be the suitable shapes such as rectangle, triangle or circle.
In the demister 24, the inner surface of the outer barrel 24-4 is preferably provided with cross sectional shape as shown in FIG. 6
The section of groove 24-6, groove 24-6 are made of a circular arc and straight line section;Wherein circular arc and outer barrel 24-4 inner surfaces
The intersection point of circumference does the tangent line of circular arc and circumference respectively, and the angle between tangent line is α, and α is 5 ° ~ 70 °, preferably 10 ° ~ 40 °;Circle
The tangent line of circular arc and the angle of straightway done at arc and straightway intersection point is β, and β is 30 ° ~ 110 °, preferably 45 ° ~ 90 °.
The depth Z of groove 24-6, i.e. circular arc are outer barrel 24-4 with the shortest distance on straightway intersection point to outer barrel 24-4 inner surface circumference
0.1 ~ 0.7 times of wall thickness, preferably 0.3 ~ 0.5 times;The intersection point and straightway and outer barrel of circular arc and outer barrel 24-4 inner surface circumference
Arc length X between the intersection point of 24-4 inner surface circumference is the 1/80 ~ 1/6 of outer barrel 24-4 inner surface circumference.
The junction of 24 each component of demister ensures sealing, does not generate gas leak phenomenon.
The demister 24, when work, the gas of entrained drip enters riser 24-2 from tower tray 24-1 lower spaces,
Vapor Entrainment liquid phase rises, and gas phase flow direction changes after encountering capping plate 24-5, i.e., by ascent direction be changed to it is horizontal or
Level of approximation direction, and part droplet is since effect of inertia collides with capping plate 24-5, and it is attached to capping plate 24-5
On, the drop of attachment becomes larger, when the gravity that drop arrives greatly its own generation is more than the climbing power and liquid surface of gas
When the resultant force of power, drop is just separated from the surfaces capping plate 24-5, and first time gas-liquid separation is completed;Entrained drip
Gas enters rectification channel 24-3 along horizontal or level of approximation direction, since rectification channel 24-3 has certain length, and rectification
Channel 24-3 total sectional areas be less than riser 24-2 cross-sectional areas, the gas of the more dispersed entrained drip of script directional velocity,
After entering rectification channel 24-3, directional velocity is changed to the direction along rectification channel 24-3, directional velocity comparison rule sum aggregate
In, and since circulation area reduces, speed increases after so that the gas of entrained drip is entered rectification channel 24-3.The gas of entrained drip
When the directional velocity of body changes, partial drop collides with rectification channel 24-3 inner walls, and is attached in the 24-3 of rectification channel
It on wall, and then is constantly flowed through the gas blowout rectification channel 24-3 of rectification channel 24-3 and is fallen, complete second of gas-liquid point
From.Meanwhile in the 24-3 of rectification channel, since the gas velocity direction of entrained drip changes, part droplet is in inertia masterpiece
With lower generation mutually collision, droplet aggregation becomes big drop, and speed when the gas stream rectified channel 24-3 of entrained drip
Increase, exacerbate the movement of drop, improve the probability that droplet mutually collides, droplet is made to be easier to assemble as big liquid
Drop, and with gas with larger speed outflow rectification channel 24-3.The gas of the entrained drip flowed out from rectification channel 24-3
Body has larger speed, and directional velocity compares concentration, and the drop carried secretly is bigger, and continuation is touched with outer barrel 24-4 inner walls
It hits, changes the flow direction of gas again, i.e., the gas of entrained drip along the rectification channel directions 24-3 by being changed to along outer barrel
The circumferencial direction of 24-4 inner walls flows.Since the gas velocity of entrained drip is larger, and along the outer barrel for opening up fluted 24-6
The rotation of 24-4 inner walls flows up, therefore will produce obvious shaving effect.The shaving effect, refers to entrained drip
High-speed gas along outer barrel 24-4 inner walls rotation flow up when, drop is constantly thrown toward outer, liquid under the action of inertia force
Drop enters groove 24-6 and the arc section in groove 24-6 moves, and since angle α is 5 ° ~ 70 °, drop can be made to continue on
The arc surface of groove 24-6, which is done, smoothly to be moved, and aggregation is contacted between drop and is become larger, until encountering, straightway is hindered, and aggregation becomes
Big drop is hit strongly with straightway wall surface, and is attached on the straightway of outer barrel 24-4 inboard wall grooves 24-6, and drop continues
Assemble and become larger, and then goes downstream along outer barrel 24-4 inner walls;And gas then continues that high speed is kept to rotate along outer barrel 24-4 inner walls
It flows up, realizes gas-liquid separation for the third time, and reduce entrainment.By above-mentioned rectification, acceleration and shaving effect,
Fluid is set to realize the separation of drop and gas in flow process.
The mist eliminating zone 10 is preferably connected by cone-shaped reducing 11 with flue gas emission area 12, the mist eliminating zone 10 with
The tower diameter ratio in flue gas emission area 12 is 1.2 ~ 5.
The flue gas emission area 12 is generally 25 structure of chimney in conventional flue gas wet desulphurization process, the cigarette
25 bottom of chimney is connected with 10 tower body of mist eliminating zone, is preferably connected with 10 tower body of mist eliminating zone by cone-shaped reducing 11,25 top of chimney
Exhanst gas outlet is set;It is preferred that outer sleeve 26 is arranged at 25 top of chimney, the outer sleeve 26 is the tubular structure of upper and lower opening,
Can be cylindric or cone cylinder shape, 26 upper edge of outer sleeve be higher by 25 top certain distance of chimney, generally 0.2~10m, preferably
0.5~5m, the lower edge of outer sleeve 26 are less than the upper edge of chimney 25, preferably shorter than 25 0.5 ~ 5m of upper edge of chimney;The outer sleeve
The diameter of 26 bottom openings is more than 25 open top diameter of chimney, preferably 1.01~1.2 times of 25 open top diameter of chimney;
The flue gas enters outer sleeve 26 from 25 top of chimney, and from 26 top discharge of outer sleeve, the gas velocity of flue gas is higher, outer flowing through
Can generate negative pressure when sleeve 26 between chimney 25 and outer sleeve 26, air flowed through under the suction of negative pressure chimney 25 with it is outer
Annular space between sleeve 26 enters 26 top of outer sleeve, air mixed with flue gas in outer sleeve 26 after together from outer sleeve
26 top discharges, flue gas have just been sufficiently mixed with air before leaving 26 top discharge of outer sleeve, have significantly reduced " white cigarette "
Production quantity.
Embodiment
Liquid bath area 2 is held in a kind of flue-gas dust-removing and desulfurization tower, including pretreatment unit 1, advanced treatment unit 3 and bottom of tower, pre- to locate
Reason unit 1 is connected to advanced treatment unit 3 by flue, and three constitutes " Jiu shapes " structure.Pretreatment unit 1 is from top to bottom
It is followed successively by chilling spraying zone 4, level-one spraying zone 5, venturi grid scrubbing section 6;During advanced treatment unit 3 is followed successively by from the bottom to top
Bu Chi liquid baths area 7, two level spraying zone 8, mist eliminating zone 10, flue gas emission area 14.
4 top of chilling spraying zone is connected with flue gas pipeline 1-1, and two layers of spray pipe I 16, spray is arranged in chilling spraying zone 4
The distance between pipeline I 16 be 2m, spray pipe I 16 setting there are one vertically upward with a heavy caliber mist vertically downward
Change nozzle 15, the inlet attack caliber of heavy caliber atomizer 15 and the ratio of chilling spraying zone tower diameter are 0.03, spray angles
It is 150 °.
Two layers of spray pipe II 17 is arranged in level-one spraying zone 5, and the distance between spray pipe II 17 is 2m, spray pipe
17 loop slurry pipeline II 5-1 connections of II are provided with several atomizers 18 on spray pipe II 17.Venturi grid
Scrubbing section 6 is provided with two layers of venturi grid 19, and two layers of venturi grid 19 is staggered.
Bottom of tower hold liquid bath area 2 close to tower wall side be separately connected alkaline solution line I 2-4, bottom of tower overflow line 2-2 and
Flow control valve is set on liquid level gauge 2-1, alkaline solution line I 2-4, and bottom of tower is held 2 bottom of liquid bath area connection bottom of tower slurries and taken out
Go out pipeline 2-3.
Middle part holds liquid bath area 7 and several liters of inflators 22 and two overflow pipe I 21 is arranged, and 21 height of overflow pipe I is less than liter gas
22 height of cylinder, middle part hold 20 bottom of liquid bath and are connected with middle part circulation fluid extraction pipeline 7-3;Liquid bath area 7 is held close to tower wall one in middle part
Side is connected with fresh water pipeline 7-1 and alkaline solution line II 7-2, fresh water pipeline 7-1, alkaline solution line II 7-2
Flow control valve is arranged in upper distribution.
Two layers of spray pipe III 23 is arranged in two level spraying zone 8, and the distance between spray pipe III 23 is 2m, spray tube
In the middle part of the connections of line III 23 multiple atomizers 18 are provided on circulation fluid pipeline 8-1, spray pipe III 23.
Two level spraying zone 8 is preferably connected by reverse taper deformation diameter 9 with mist eliminating zone 10, and setting is several as schemed in mist eliminating zone 10
Demister 24 shown in 3 ~ 6, mist eliminating zone 10 are preferably connected by cone-shaped reducing 11 with flue gas emission area 12.
25 structure of chimney in conventional flue gas wet desulphurization process is arranged in flue gas emission area 12, and 25 bottom of chimney passes through cone
Bodily form reducing 11 is connected with 10 tower body of mist eliminating zone, outer sleeve 26 is arranged at 25 top of chimney, outer sleeve 26 is the circle of upper and lower opening
Tubular structure, 26 upper edge of outer sleeve are higher by 25 top 5m of chimney, and the lower edge of outer sleeve 26 is less than 25 0.5 ~ 5m of upper edge of chimney, housing
1.1 times of the 25 open top diameter of a diameter of chimney of 26 bottom openings of cylinder.
The technique of a kind of flue-gas dust-removing and desulfurization and demisting, including following content:
Flue gas enters flue-gas dust-removing and desulfurization tower from the top of pretreatment unit 1, and progress is contacted with the loop slurry of chilling spraying zone 4
Chilling cools down and removes the part dust and sulfur dioxide that are carried in flue gas, enters level-one spray across the flue gas of chilling spraying zone
Area 5, together by venturi grid scrubbing section 6 after level-one spraying zone 5 is mixed with loop slurry, dust and dioxy in flue gas
Change the components such as sulphur to be absorbed by loop slurry;Loop slurry completes gas-liquid separation with flue gas, and loop slurry enters bottom of tower and holds liquid bath area
2, the riser 22 that flue gas holds liquid bath 7 through middle part enters two level spraying zone 8, with the circulation fluid counter current contacting of two level spraying zone 8 into
Row depth dust-removal and desulfurizing, the flue gas by two level spraying zone 8 enter mist eliminating zone 10, small through being carried in the removing flue gas of mist eliminating zone 10
Water droplet enters after outer sleeve 26 is sufficiently mixed with air from 25 top of chimney in flue gas emission area 12 from the top of flue gas emission area 12
Discharge.
Certain enterprise's exhaust gas volumn is 150000Nm3/ h, flue-gas temperature are 190 DEG C, pressure 8kPa, wherein SO2It is a concentration of
890mg/Nm3, dust concentration 240mg/Nm3, using flue-gas dust-removing and desulfurization tower of the present invention, chilling spraying zone and level-one
Spraying zone loop slurry flow is 1200m3/ h, two level spraying zone circulating fluid flow rate are 1000m3/ h, purified flue-gas temperature are
50 DEG C, wherein SO2A concentration of 18mg/Nm3, dust content 10mg/Nm3, the white cigarette of gas vent obviously eliminates.
Claims (21)
1. a kind of flue-gas dust-removing and desulfurization tower, it is characterised in that:Liquid bath is held including pretreatment unit, advanced treatment unit and bottom of tower
Area, pretreatment unit are connected to advanced treatment unit by flue, and three constitutes " Jiu shapes " Double-Tower Structure;Pretreatment unit
From top to bottom it is followed successively by chilling spraying zone, level-one spraying zone, venturi grid scrubbing section;Advanced treatment unit is from the bottom to top successively
Liquid bath area, two level spraying zone, mist eliminating zone and flue gas emission area are held for middle part;The chilling spraying zone top and flue gas pipeline phase
Even;Chilling spraying zone axis sets up several opening upwards or downward heavy caliber atomizer, each heavy caliber atomizer
It is connected with spray pipe I, the inlet attack caliber of heavy caliber atomizer and the tower diameter ratio of chilling spraying zone be 0.005 ~
0.1, heavy caliber atomizer spray angles are 60 ~ 150 °;The flue gas emission area is chimney structure, chimney bottom and demisting
Area's tower body is connected, and exhanst gas outlet is arranged in chimney top;Outer sleeve is set in chimney top, the outer sleeve is upper and lower opening
Tubular structure, outer sleeve upper edge are higher by chimney top certain distance, and the lower edge of outer sleeve is less than the upper edge of chimney, the housing
It is annular space between cylinder and chimney.
2. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The pretreatment unit and advanced treating
Unit tower diameter ratio is 0.2 ~ 1.
3. fuel gas desulfurization gas wash tower described in accordance with the claim 1, it is characterised in that:Outer sleeve upper edge is higher by chimney top 0.2
~10m;The lower edge of outer sleeve is less than 0.5 ~ 5m of upper edge of chimney;The a diameter of chimney top opening of the outer sleeve bottom opening
1.01~1.2 times of diameter.
4. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The big mouth that chilling spraying zone axis is set up
In diameter atomizer, the opposite heavy caliber atomizer of a pair of openings is included at least.
5. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The level-one spraying zone be arranged one layer or
Multi-layer sprinkling pipeline II, when Multi-layer sprinkling pipeline II is arranged, the distance between spray pipe II is 0.5 ~ 5m;The spray tube
It is provided with multiple atomizers on line II connection loop slurries pipeline II, spray pipe II.
6. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The venturi grid scrubbing section setting
There is one or more layers venturi grid;Two layers neighbouring of venturi grid is staggered when using multilayer venturi grid.
7. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:Liquid bath area is held close to tower wall in the bottom of tower
Side is separately connected alkaline solution line I, bottom of tower overflow line and liquid level gauge;Flow is set on the alkaline solution line I
Regulating valve adjusts its pH value for filling alkaline solution into bottom of tower slurries;Hold liquid bath area bottom connection bottom of tower in the bottom of tower
Slurries extract pipeline out, and slurries extraction pipeline in bottom of tower is connected with bottom of tower circulating pump.
8. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:It is several that the setting of liquid bath area is held at the middle part
Inflator is risen, the flue gas from pretreatment unit enters advanced treatment unit through flue, enters two level spray by a liter inflator
Area;The one or more overflow pipe I of liquid bath area setting are held at the middle part, and for overflow pipe I height less than inflator height is risen, liquid is held at middle part
Circulation fluid in slot enters bottom of tower by overflow pipe I and holds liquid bath area;It holds liquid bath bottom and is connected with middle part circulation fluid in the middle part
Extract pipeline out, circulation fluid extraction pipeline in middle part is connected with middle part circulating pump.
9. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:Liquid bath area is held close to tower wall in the middle part
Side is connected with fresh water pipeline and alkaline solution line II;Flow control valve is set on the fresh water pipeline, according to tower
The flow of the Signal Regulation fresh water of bottom liquid level gauge feedback, is used for the liquid level in control tower Di Chi liquid baths area;The alkaline solution
It is provided with flow control valve on pipeline II, extracts the Signal Regulation for the pH meter feedback being arranged on pipeline out according to middle part circulation fluid in
The flow of the alkaline solution of Bu Chi liquid baths area filling.
10. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The two level spraying zone is arranged one layer
Or Multi-layer sprinkling pipeline III;When Multi-layer sprinkling pipeline III is arranged, the distance between spray pipe III is 0.5 ~ 5m;Described
Circulation fluid pipeline in the middle part of spray pipe III connections is provided with multiple atomizers on spray pipe III.
11. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The mist eliminating zone is provided with demister,
Demister includes several demisting components arranged side by side, and each demisting component includes riser and outer barrel, and outer barrel is arranged in a liter gas
The outside of pipe;Riser is fixed on mist eliminating zone tower tray, the top setting capping plate of riser;It is uniformly set on the circumference of riser
Several rectification channels are set, rectification channel is embedded in along the tangential direction level of riser outer wall, and rectification channel is close to outer barrel side
Side wall I and riser tube wall are tangent, and another side wall II intersects with riser tube wall, and each rectification channel direction of rotation is identical;Rectification
Channel roof is flushed with capping plate, and bottom is intersected with riser tube wall.
12. flue-gas dust-removing and desulfurization tower according to claim 11, it is characterised in that:In the demister, rectification channel
Length l be side wall II length, maximum horizontal ranges of the width w for the two side of rectification channel between, height h be rectification channel top
Maximum normal distance between portion and bottom;Wherein length l is 2 ~ 5 times of width w;The total sectional area in rectification channel is that riser is horizontal
0.2 ~ 0.9 times of sectional area.
13. flue-gas dust-removing and desulfurization tower according to claim 11, it is characterised in that:In the demister, described is outer
Groove is arranged in the inner surface of cylinder, and the section of the groove is made of a circular arc and straight line section;Wherein circular arc and table in outer barrel
The intersection point of face circumference does the tangent line of circular arc and circumference respectively, and the angle between tangent line is α, and α is 5 ° ~ 70 °;Circular arc is handed over straightway
The tangent line of circular arc and the angle of straightway that point place is done are β, and β is 30 ° ~ 110 °;The depth Z of groove, i.e. circular arc and straightway
The shortest distance on intersection point to outer tube inner surface circumference is 0.1 ~ 0.7 times of outer barrel wall thickness;Circular arc and outer tube inner surface circumference
Arc length X between intersection point and straightway and the intersection point of outer tube inner surface circumference is the 1/80 ~ 1/6 of outer tube inner surface circumference.
14. flue-gas dust-removing and desulfurization tower described in accordance with the claim 1, it is characterised in that:The mist eliminating zone and flue gas emission area
It is connected by cone-shaped reducing, the tower diameter ratio in the mist eliminating zone and flue gas emission area is 1.2 ~ 5.
15. a kind of dusting and desulfurizing technology for smoke, it is characterised in that:The process employs the flue gas ash removals described in claim 1 ~ 14
Desulfurizing tower.
16. technique according to claim 15, it is characterised in that including following content:Flue gas is from the top of pretreatment unit
Into flue-gas dust-removing and desulfurization tower, is contacted with the loop slurry of chilling spraying zone and carry out chilling cooling and remove the portion carried in flue gas
Divide dust and sulfur dioxide, enters level-one spraying zone across the flue gas of chilling spraying zone, it is mixed in level-one spraying zone and loop slurry
Together by venturi grid scrubbing section after conjunction, the components such as dust and sulfur dioxide in flue gas are absorbed by loop slurry, flue gas
Temperature is reduced to 50 ~ 70 DEG C;Loop slurry completes gas-liquid separation with flue gas, and loop slurry enters bottom of tower and holds liquid bath area, flue gas warp
The riser that liquid bath is held at middle part enters two level spraying zone, and it is de- to carry out depth dedusting with the circulation fluid counter current contacting of two level spraying zone
Sulphur, the flue gas by two level spraying zone remove the small water droplet carried in flue gas, the chimney top from flue gas emission area through mist eliminating zone
From flue gas emission area top discharge after being sufficiently mixed into outer sleeve and air.
17. technique according to claim 15, it is characterised in that:SO in the flue gas2A concentration of 50 ~ 5000mg/Nm3,
Dust concentration is 30 ~ 600mg/Nm3。
18. technique according to claim 15, it is characterised in that:The operating condition of the flue-gas dust-removing and desulfurization tower is:
Operation temperature is 60 ~ 300 DEG C, and operating pressure is 0.1 ~ 500kPa, and treatment quantity is 1000 ~ 1000000Nm3/h。
19. technique according to claim 15, it is characterised in that:The chilling spraying zone, level-one spraying zone, two level spray
The liquid-gas ratio drenched in area is 2 ~ 50L/Nm3。
20. technique according to claim 15, it is characterised in that:The loop slurry holds liquid bath area from bottom of tower, warp
After the circulating pump pressurization of bottom of tower, a part enters chilling spraying zone and carries out chilling cooling to flue gas, and another part enters level-one spray
Area is dusted desulfurization to flue gas, remaining is delivered to subsequent cell through comb line outside loop slurry and is handled;The bottom of tower
The liquid level for holding loop slurry in liquid bath area is controlled by the regulating valve on fresh water pipeline;Hold liquid bath area in the bottom of tower
Loop slurry pH value control 6 ~ 11.
21. technique according to claim 15, it is characterised in that:The circulation fluid in liquid bath is held at the middle part, through middle part
Enter two level spraying zone after circulating pump pressurization, is atomized through atomizer and is contacted with flue gas adverse current to the dedusting of flue gas progress depth, taken off
Sulphur;The pH value that the circulation fluid in liquid bath area is held at the middle part is controlled 6 ~ 8.
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|---|---|---|---|---|
| CN114345113A (en) * | 2022-03-21 | 2022-04-15 | 浙江浩普环保工程有限公司 | Strong mass transfer self-adaptation absorption tower |
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